ABAP Select data from SAP table P20_ATRT4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P20_ATRT4 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to P20_ATRT4. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the P20_ATRT4 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_P20_ATRT4 TYPE STANDARD TABLE OF P20_ATRT4,
      WA_P20_ATRT4 TYPE P20_ATRT4,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <P20_ATRT4> TYPE P20_ATRT4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P20_ATRT4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P20_ATRT4
  INTO TABLE IT_P20_ATRT4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P20_ATRT4
*  INTO TABLE @DATA(IT_P20_ATRT42).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_P20_ATRT4 INDEX 1 INTO DATA(WA_P20_ATRT42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P20_ATRT4 ASSIGNING <P20_ATRT4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P20_ATRT4>-RECAR = 1.
<P20_ATRT4>-RECTY = 1.
<P20_ATRT4>-ORGNO = 1.
<P20_ATRT4>-FDNUM = 1.
<P20_ATRT4>-LTKOD = 1.

ENDLOOP.

LOOP AT IT_P20_ATRT4 INTO WA_P20_ATRT4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P20_ATRT4-BELOP5, sy-vline,
  WA_P20_ATRT4-SIGN5, sy-vline,
  WA_P20_ATRT4-BELOP1, sy-vline,
  WA_P20_ATRT4-SIGN1, sy-vline,
  WA_P20_ATRT4-ANTALL, sy-vline,
  WA_P20_ATRT4-ASIGN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P20_ATRT4 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_P20_ATRT4 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_P20_ATRT4 INTO WA_P20_ATRT4.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_P20_ATRT4_STR, 
RECAR TYPE STRING,
RECTY TYPE STRING,
ORGNO TYPE STRING,
FDNUM TYPE STRING,
LTKOD TYPE STRING,
BELOP5 TYPE STRING,
SIGN5 TYPE STRING,
BELOP1 TYPE STRING,
SIGN1 TYPE STRING,
ANTALL TYPE STRING,
ASIGN TYPE STRING,
LAND TYPE STRING,
AAR TYPE STRING,
BELOP2 TYPE STRING,
SIGN2 TYPE STRING,
BEGDM TYPE STRING,
ENDDM TYPE STRING,
ANDAG TYPE STRING,
BELOP3 TYPE STRING,
SIGN3 TYPE STRING,
BELOP4 TYPE STRING,
SIGN4 TYPE STRING,
DIV1 TYPE STRING,
DIV2 TYPE STRING,
RFDNM TYPE STRING,
TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P20_ATRT4_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_P20_ATRT4_STR-RECAR sy-vline 
WA_P20_ATRT4_STR-RECTY sy-vline 
WA_P20_ATRT4_STR-ORGNO sy-vline 
WA_P20_ATRT4_STR-FDNUM sy-vline 
WA_P20_ATRT4_STR-LTKOD sy-vline 
WA_P20_ATRT4_STR-BELOP5 sy-vline 
WA_P20_ATRT4_STR-SIGN5 sy-vline 
WA_P20_ATRT4_STR-BELOP1 sy-vline 
WA_P20_ATRT4_STR-SIGN1 sy-vline 
WA_P20_ATRT4_STR-ANTALL sy-vline 
WA_P20_ATRT4_STR-ASIGN sy-vline 
WA_P20_ATRT4_STR-LAND sy-vline 
WA_P20_ATRT4_STR-AAR sy-vline 
WA_P20_ATRT4_STR-BELOP2 sy-vline 
WA_P20_ATRT4_STR-SIGN2 sy-vline 
WA_P20_ATRT4_STR-BEGDM sy-vline 
WA_P20_ATRT4_STR-ENDDM sy-vline 
WA_P20_ATRT4_STR-ANDAG sy-vline 
WA_P20_ATRT4_STR-BELOP3 sy-vline 
WA_P20_ATRT4_STR-SIGN3 sy-vline 
WA_P20_ATRT4_STR-BELOP4 sy-vline 
WA_P20_ATRT4_STR-SIGN4 sy-vline 
WA_P20_ATRT4_STR-DIV1 sy-vline 
WA_P20_ATRT4_STR-DIV2 sy-vline 
WA_P20_ATRT4_STR-RFDNM sy-vline 
WA_P20_ATRT4_STR-TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.